libesmtp: update/fix site URL
The old URL was not working for quite some time.
Signed-off-by: Marcel Patzlaff <m.patzlaff@pilz.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 43e7667fc82d55d0a9fdfad91375a0621efb7576)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>